Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec283719d2d60fb6…

MALICIOUS

PDF

96.7 KB Created: 2021-07-03 09:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 730590f8913655d78ce16740f040c350 SHA-1: bc8b7e75a297530d44101a90031c63009d7091f0 SHA-256: ec283719d2d60fb6baff06b4b823c6325a0d93f14cba06bf4916e265207842bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or link-farming attack pattern. The presence of urgency and callback lures further supports a phishing or scam-related objective. No scripts were extracted, but the PDF structure itself is leveraged to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=sony+mp3+ic+recorder+icd+ux200+manual
    • https://festival.bg/fckeditorfiles/file/xezofenojimonorawasutameb.pdf
    • http://innova-perila.ru/upload/files/zemodadarez.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbd98a1e0---xuvujetetexaludedobax.pdf
    • https://nnkcreations.com/userfiles/file/gomipo.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/likilidufowulewawetawa.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3ba942e4---71778672369.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7e78ab88---91219626849.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b724b0b3---mumotevewasanu.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609be5a5de50f---jedulexotopufewo.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd2c12b28---79967183592.pdf
    • https://audreyheselmans.com/_files/file/kiseliwariz.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a83622922---zotepuforupeligef.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/er9lt6h97uqpust56vscmjr4ts/roliluvifuwiwuwalitomevu.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/67rkt6dmejjr4tpiqo5hij4kk7/14525876207.pdf
    • http://sun-eko.eu/files/file/71676353963.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfbb711c3---pogofegiluxotunatamener.pdf
    • https://ikansambel.com/contents//files/pexuvabuwuzegefiwanavavut.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6f8ed39901847d0baeb925b0c09a5ee/51065332754.pdf
    • http://skncn.com/u/files/rivebimo.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5b250ea59---32468093098.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e839cb4c---lakokomosowinenuzofus.pdf
    • http://sdds.be/userfiles/file/buzoferiwaza.pdf
    • http://purofirstli.net/userfiles/file/zuxad.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608702f6db5cd---33542276874.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f244.bin
32afc026389697231e1395b02e123c4e8968beb6a3201b1b8dcb46761e7421e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 18988 bytes
font_01_sfnt_off000122ae.bin
aea76d9657252b94203bc9f005f7b596dd06e8ef8cb110c23aca19a47e74f29d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16448 bytes
font_02_sfnt_off00013969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 16792 bytes
font_03_sfnt_off00015180.bin
b0281b5c88c8fe48a7506b41fa592322fa6e690545e365ceac189e850f759065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15180 11216 bytes
font_04_sfnt_off00016bbf.bin
c586b91be2940c6da5c4ddb43771707b0c54fe4e067657ef5fe345f7ea825bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBF 1824 bytes

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